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First time mums

12 weeks jags and not eating

My LO had his 12 week jags today at 930am and had been so fussy and i could tell he was uncomfortable all day. He then did a huge poo around 430pm which totally settled him but after that hes just slept and hes hardly ate in about 8 hours. I breastfeed so not 100% in oz what he usually takes but he normally feeds every 2 or 3 hrs sometimes more 🙈 is it normal for baby to not want as much food after the jags ? He was totally fine after his first lot !